High-Low-Epsilon Biaxial Anisotropic Lens for Enhanced Gain and Aperture Efficiency of a Linearly Polarized Antenna

OPEN High Gain Low-Cost Antenna Based on the Utilization of Diffracted Fields from Semi-Ring Shape Dielectric Edges

“…In the proposed case this requirement is not needed. In (11) we calculate the Fresnel zones when the focal length approaches zero. Fig.…”

“…Fig. 26 compares the calculated zones using equation (11), and the proposed dipole and slot structures zones. As can be seen, the first ring has the highest error (~35%), due to the short distance from the source, and the fact that the source is not ideally spherical, so the first ring task is to maintain the spherical behavior for the next zone, and this is achieved by the slab radiating aperture in the yz-plane, consequently the error in the next slabs is reduced to be less than 10 % for the dipole case, and 15% for the slot case.…”

“…As the slot width increases to widen the impedance bandwidth, its radiation pattern deviates more from the ideal omnidirectional radiation pattern. From such analysis we can use the (11) to calculate a crude value for the rings radii, and with a full wave solver the 10-15% error can be fine-tuned to optimize the gain. Another advantage is that the dielectric material permittivity provides another degree of freedom to control the passage of the wave, where the reflectivity can be controlled by its size, and hence enable further control of the ratio of the reflected to transmitted power, this is very important for the control of power tapering and the side-lobe level.…”

“…For example, reflector antennas are well known for their high directivity, and recently reflect/transmit-arrays as well [8]- [10]. Lenses can focus the radiation in the intended direction, and hence possess a high-gain performance [11]. These structures can achieve high performance metrics, but on the other hand, they are well-known for being non-planar and bulky, which make it not suitable for highly integrated systems.…”

High gain low-cost antenna based on the utilization of diffracted fields from semi-ring shape dielectric edges

“…For example, reflector antennas are well known for their high directivity, and recently reflect/transmit-arrays as well 8 – 10 . Lenses can focus the radiation in the intended direction, and hence possess a high-gain performance 11 . These structures can achieve high performance metrics, but on the other hand, they are well-known for being non-planar and bulky, which make them not suitable for highly integrated systems.…”